Created By : Vaibhavi Kumari

Reviewed By : Phani Ponnapalli

Last Updated : May 10, 2023

The Magnetic Field of Straight Current-Carrying Wire Calculator is an easy-to-use tool that describes the magnetic field produced by a long, straight current-carrying wire. To examine the strength of the magnetic field formed around the wire in a short period, simply enter the current and distance from the wire in the fields and press the calculate button.

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Magnetic Field of a Wire

The magnetic field is defined as an area around the magnet that is invisible to the naked eye. It can be measured by looking at the strength and direction of the magnetic field.

According to Maxwell's equation, the magnetic field is always created by flowing electric current. The magnetic field lines from the concentric circles when an electric current goes through a straight wire, and the strength of the magnetic field is proportional to the distance from the wire and the current passing through it.

To find the magnetic field around a wire, we typically use the right-hand thumb rule or cross-product. The magnetic field of a straight current-carrying wire can be calculated using the following formula B = μo x I/(2πd)

  • Where, μo = permeability of free space.
  • μo = 4π x 10^-7 Tm/A
  • B = magnetic field strength produced at a distance
  • d = distance from the wire
  • I = current

How can I find a magnetic field?

See the section on calculating the magnetic field around a wire for more information. To quickly determine the strength of the magnetic field, obtain the basic methods and directions and follow them.

  • Step 1: Find the distance from the wire and current flowing through the wire.
  • Step 2: Multiply the distance by the double of π
  • Step 3: Multiply the current by the free space constant's permeability.
  • Step 4: To calculate the magnetic field, divide the above product by the product from step 2.

For more concepts check out to get quick answers by using this free tool.

How to Use the Magnetic Field of Straight Current-Carrying Wire Calculator?

The calculator can be used to calculate the magnetic field of a straight current-carrying wire in the following way

  • Step 1: In the input field, enter the current, distance of wire and x for the unknown.
  • Step 2: To acquire the result, click the "Calculate the Unknown" button.
  • Step 3: Finally, in the output field, the magnetic field will be presented.

Magnetic Field of Straight Current-Carrying Wire Examples

Question 1: If a straight long wire is carrying 20 A of current and the distance between the wire and the ground is 5 metres, Determine the magnetic field's strength surrounding the wire?


Given: I = 20 A

d = 5 m

Magnetic field B = μo x I/(2πd)

B = [4π x 10^-7 x 20]/(2π x 5)

= 8 x 10^-7

Therefore, the magnetic field around the wire is 8 x 10^-7 T.

FAQs on Magnetic Field of Straight Current-Carrying Wire

1. How do you determine the magnetic field surrounding a current-carrying straight wire?

A current segment can be used to determine the magnetic field strength using the Biot-Savart Law. It is reduced to the form B=μ0I2πr for the basic cause of an infinite straight current-carrying wire.

2. In a magnetic field, what happens to a current-carrying wire?

A current flowing through a wire forms a circular magnetic field around it. The needle of a magnetic compass can be deflected by this magnetic field. The magnetic field is stronger closer to the wire, and it grows stronger as the current increases.

3. What is the magnetic and electric field combination?

Electromagnetic waves are a mix of electric and magnetic field waves produced by moving charges.

4. What is the magnetic moment formula?

The formula for Magnetic Moment: A magnetic moment is a vector that connects an object's torque to its magnetic field. τ = m × B is the mathematical expression for this.

5. How is a current-carrying wire placed in a magnetic field without being affected by the magnetic field?

A current-carrying wire is put (A) parallel to the magnetic field, such that it is not affected by the magnetic field. Explanation: The current-carrying wire is subjected to magnetic force when it is put in a magnetic field.